It is, and Monero tx fees are pretty low right now - but as it continues to gain adoption, fees will rise. Cashu enables microtransactions and zaps for small amounts. Its not essential, but it can be fun, and a good way for newcomers to get a taste of freedom at trivial cost. Yeah, its custodial (but trivially anonymised), but that just means a different threat model - its small change in a pocket, not a wallet.

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Fees will always remain relatively low on Monero because of dynamic blocksize. But I do think ecash has it's own unique benefits for a different use case like micro transactions, no public blockchain, instant and offline payments, etc